Wanhao D9 Y Axis Belt Tensioner - 6mm version AND 9mm version

thingiverse

Tensioner for the Y axis belt on the Wanhao Duplicator 9. If you downloaded V6, please delete and re-download this to correct a cosmetic bad fillet on the idler holder. I've included two versions: one for the original 6mm belt and one for the newer 9mm belt. Simply screw in the two screws at the front to move the carriage and tighten the belt! Move each screw a few turns at a time only to ensure the idler holder stays fairly level. When you're finished tightening, make sure there's an even space on the left and right side, and you'll be good to print. This was a 2-hour print at 60% infill, 80mm/s, using less than 30 grams of filament. Suggestions are welcome! Note: Some users have reported it doesn't work well with the 400. There's a shorter remix available here: https://www.thingiverse.com/thing:4167171 V6 - 9mm Belt version added, thanks to A Gibson and D Griffin for providing the required measurements. I've widened the central idler holder from 12mm to 15mm, which should work and give the same tolerances as the 6mm belt. There's a small change to the larger surround also to ensure the idler holder is stiff. V6 - FINAL uploaded, prints well! You need: * 3 x M5 Nuts (mine were 3mm tall) * 2 x M5 x 30 Cap Head screws (cap head not essential; you could get away with slightly shorter also) * 1 x M5 x 25 screw for the Idler wheel Optional: * 2 x M5 Washers, the ones I had were 12.2mm diameter so I've put a 12.7mm "hole" there for them to sit in V5 Uploaded: Complete re-design, as small as I think it can go now and still be stable. Should fit perfectly! You'll need: * Two M5x30 screws for the tensioning part * An M5x25 screw for the idler * 3 x M5 nuts * Some space at the rear for M5 washers also to reduce stress on the printed part when adjusting V3 Uploaded: Slightly slimmer design and increase in hex nut hole sizes. Also slight depth increase for the standard 18mm diameter idler, should give 1/2mm or 1mm clearance all round now.